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gunner_for_hire 
Member - Posts: 37
Member spacespace
Joined: January 18, 2003
Location: United States
Posted: February 06, 2003 at 3:24 PM / IP Logged  

I'm installing an Autopage RS-750lcd on a 1997 GMC yukon 2-door...

The RS-750lcd has a 10A, 12V output for the parking light flash option.  I would like to add a 30A Relay so that I don't exceed this 10A ceiling if my boat trailer is hooked up.  My question is:

1. Should I consider this, i.e. would a trailer overload this circuit?

2.  What would the relay schematic be for this setup?

3.  Can I just tap the parking light wire at the headlight switch as opposed to cutting the wire and making one lead 30 and the other 87a?

Thanks,

--JJ

Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: February 06, 2003 at 3:51 PM / IP Logged  

Using a relay will only isolate the CPU of RS750 from the parking light circuit. You can use the realy but it will not be necessary. If you do want to as a precaution you can use this relay configuration:

Positive to Positive Relay Diagram

This will isolate the parking light wire of the RS750 from the parking light circuit of the Chevy.

Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
gunner_for_hire 
Member - Posts: 37
Member spacespace
Joined: January 18, 2003
Location: United States
Posted: February 06, 2003 at 4:18 PM / IP Logged  

So I can just tap the parking light wire (without cutting it) with the 10A output from the RS-750 and I should be in business?

Thanks,

--JJ

Player69 
Silver - Posts: 504
Silver spacespace
Joined: October 27, 2002
Posted: February 06, 2003 at 4:22 PM / IP Logged  
You can count on about 2 amps per light.  Chances are your fuse will blow on the park light circuit of your starter if you don't isolate it.  Depending on how heavy the wires are on the park light output and the internal components you could likely just get away with changing the fuse to a 15A or 20A which would be more then enough.
gunner_for_hire 
Member - Posts: 37
Member spacespace
Joined: January 18, 2003
Location: United States
Posted: February 06, 2003 at 4:26 PM / IP Logged  

In other words, add an inline fuse to the output of the RS-750?

--JJ

Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: February 06, 2003 at 4:49 PM / IP Logged  
Yes, there should be one on there from factory seeing that it is an alarm as well. Fuse the positve wire at 10 amps.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

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